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Home / DTC / U0429 — Invalid Data Received From Steering Column Control Module

U0429 — Invalid Data Received From Steering Column Control Module

Detailed page for trouble code U0429.

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Code

U0429

HYUNDAI U — Network/User

Invalid Data Received From Steering Column Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty Steering Column Control Module (SCCM)
  • Poor or corroded connector or wiring between SCCM and CAN bus
  • CAN bus short, open, or high resistance (CANH/CANL)
  • Intermittent or low voltage supply / bad ground to SCCM
  • Incompatible or corrupted SCCM software/calibration
  • Fault in other module sending steering messages (BCM, EPS, ABS, BCM)

Symptoms

  • U0429 DTC stored in ECU memory; MIL or message on dash may appear
  • Loss or degradation of steering-related features (lane assist, adaptive cruise, EPS warnings)
  • Intermittent steering assist faults or sudden change in assist feel
  • Other communication faults or U-codes present on CAN bus
  • Inability to clear or persistent recurrence of same DTC after clear

What to check

  • Read DTCs and freeze frame data from all modules with a capable scanner
  • Note related active/confirmed codes (EPS, ABS, BCM, CAN)
  • Visually inspect SCCM connector and harness for corrosion, bent pins, breaks or damage
  • Check vehicle battery voltage and measure power/gnd at SCCM connector with ignition on
  • Scan live data for steering messages (steering angle, torque, presence flags) from SCCM
  • Check CAN bus integrity: measure DC resistance between CANH and CANL (~60 ohms with both nodes)

Signal parameters

  • CAN message ID(s) from SCCM (manufacturer-specific ID)
  • Expected message frequency (Hz) and period consistency
  • Signal voltage levels: CANH ~2.5–3.5V, CANL ~1.5–1.5V idle/active swing
  • Bus termination resistance ~60 ohms (two 120Ω resistors in parallel)
  • Steering angle and torque sensor ranges (manufacturer expected numeric ranges)
  • Checksum and sequence counters present in SCCM messages (if applicable)

Diagnostic algorithm

  1. Connect a manufacturer-capable scan tool; record all U-codes and related codes from all modules and save freeze frame data.
  2. Clear codes and attempt to reproduce; note if U0429 returns and under what conditions (startup, driving, steering input).
  3. Inspect SCCM connector, pins and wiring harness for damage, corrosion, water ingress or repair splice; repair as needed.
  4. Verify SCCM power and ground circuits: measure battery voltage at module pins with key on, check ground resistance to chassis. Repair any poor connections.
  5. Check CAN physical layer: measure resistance between CANH and CANL (approx 60Ω). Use oscilloscope to verify clean differential waveforms, correct voltage levels and message timing. Repair shorts or noisy nodes.
  6. If physical layer is good, monitor CAN traffic with an appropriate data list: confirm SCCM messages are being transmitted and contain plausible steering angle/torque values. Compare to expected frequency/IDs.
  7. If messages are missing or invalid from SCCM, consider SCCM internal fault—reflash/reprogram SCCM software to correct calibration/firmware mismatch, then re-test.
  8. If after reflash issue remains and wiring/power/ground and bus are verified good, replace SCCM and program/configure per factory procedure.
  9. After repair, perform steering angle sensor calibration or any required relearns and clear codes. Road-test and re-scan all modules to confirm code does not return.

Likely causes

  • Damaged SCCM connector pins or corrosion
  • Open or shorted CAN wiring near steering column
  • SCCM lost power or ground intermittently causing corrupted messages
  • Software mismatch after module replacement or incomplete reprogramming
  • Faulty steering angle or torque sensors inside SCCM producing out-of-range values

Fault status

⚠️ Status
Invalid data received from Steering Column Control Module — steering messages failed plausibility or integrity checks on the vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0401 U0415 U0416 U0422 U0423 U0430
371

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